Primary Objective:

To assess the effects of subcutaneous (SC) doses of alirocumab on the elimination (measured by Fractional Clearance Rate (FCR)) of apolipoprotein B (apoB) in low density lipoprotein (LDL) in adults with mildly elevated LDL-cholesterol (LDL-C).

Secondary Objectives:

To assess the effects of SC doses of alirocumab on:

• Various parameters of the metabolism and turnover in plasma of different lipoproteins
• Plasma lipids concentration: total cholesterol, high density lipoprotein cholesterol (HDL-C), triglycerides, low density lipoprotein cholesterol (LDL-C), apoB, lipoprotein(a) (Lp(a))
• Lipoprotein particle size profile
• PCSK9 (free and total) concentrations in serum To assess safety and tolerability of alirocumab. To assess emergence of anti-alirocumab antibodies. To document serum alirocumab concentrations.

Total duration of the study per subject is 26 weeks, including a screening period of ≤ 4 weeks, placebo treatment period of 4 weeks, alirocumab treatment period of 10 weeks, and a follow up period of 8 weeks.

Inclusion criteria:

Generally healthy; LDL-C level in serum or plasma ≥ 100 mg/dL and < 190 mg/dL at Screening.

Exclusion criteria:

• LDL-C ≥ 160 mg/dL at Screening if more than 2 major Coronary Heart Disease risk factors, as defined in National Cholesterol Education Program guidelines.
• Receiving treatment of any kind for hyperlipidemia within 6 weeks of enrollment.

The above information is not intended to contain all considerations relevant to a patient's potential participation in a clinical trial.